/**
 * 
 */
package action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

import org.apache.struts2.ServletActionContext;

import util.GeneralAction;
import util.Globals;

/**
 * 通用的Action
 * @author deli.wu
 *
 */
public class CommonAction extends GeneralAction {
	/**
	 * 用于产生随机颜色
	 * 
	 * @param fc
	 * @param bc
	 * @return
	 */
	private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	/**
	 * 产生验证码
	 */
	@SuppressWarnings("unchecked")
	public String createVCode() {
		// 在内存中创建图象
		int width = 60, height = 20;
		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);
		// 获取图形上下文
		Graphics g = image.getGraphics();
		// 生成随机类
		Random random = new Random();
		// 设定背景色
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		// 设定字体
		g.setFont(new Font("Times   New   Roman", Font.PLAIN, 18));
		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}
		// 取随机产生的认证码(4位数字)
		String sRand = "";
		for (int i = 0; i < 4; i++) {
			int snum = 0;
			while(!((snum >= 'a' && snum <= 'z') || (snum >= 'A' && snum <= 'Z')))
				snum = random.nextInt(100);
			sRand += (char)snum;
			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
			g.drawString("" + ((char)snum), 13 * i + 6, 16);
		}
		// 将认证码存入SESSION
		getSession().put(Globals.validateCode, sRand.toLowerCase());
		// 图象生效
		g.dispose();
		// 输出图象到页面
		try {
			OutputStream os = ServletActionContext.getResponse()
					.getOutputStream();
			ImageIO.write(image, "JPEG", os);
			os.flush();
		} catch (Exception e) {
			//
		}
		return null;
	}
}
